摘要
采用盆栽试验,研究不同氮源对杂交稻和常规稻的生理效应。结果表明,在生育后期,NO_3-N比 NH_4-N 更有效地提高水稻叶片叶绿素,可溶性蛋白质和核糖核酸的含量;增加光合磷酸化活力和^(14)CO_2同化速率;提高内源玉米素含量,降低脱落酸的水平。这些效应因叶位和水稻品种而异,上位叶片的反应大于下位叶片,杂交稻又比常规稻明显。试验结果还表明,追施NO_3-N 者,灌浆谷粒中 ATP 水平较高,明显地推迟脱落酸高峰的出现期,并促进^(14)-同化物向穗部运输的能力。这些效应也是杂交稻优于常规稻.
Pot experiment was conducted in 1986 to investigate the effect of NO_3^- or NH_4^+ top-dressing 7 days before heading on the physiological function of the leaf blades and grains of Shanyou 6 and Zheli 1.The results showed that NO_3-N top-dressing increased significantly the chlorophyll content,the activity of photophosporylation and the rate of ^(14)CO_2 assimilation in the rice leaves,compared with NH_4-N top-dressing.The levels of both soluble protein and ribonucleic acid in the leaves with NO_3-N source.It was also shown that under NO_3-N top-dressing the zeatin contents in the rice leaves at milky stage were higher than those under NH_4-N,while under NO_3-N top-dressing at late growth stage the levels of bound and free ABA in the leaves were much lower.Varietal dif- ferences were observed between the physiological response to NO_3-N and NH_4-N at the late growth stage.The hybrid rice(Shanyou 6)was more responsive than the conventional rice variety (Zheli 1).As far as the leaf position is concerned,the physiological responses to NO_3^-/NH_4^+ top-dressing were much greater in the lower leaves than those in the up- per leaves.Compared with NH_4-N,the top-dressing of NO_3-N increased more obvious- ly the ATP level and delayed the occrunce of ABA peak during grain filling period in the grains of secondary branches,improved the translocation of ^(14)C-assimilate from leaves to ear as well,resulting in the higher percentage of full-filled grains per panicle.
出处
《作物学报》
CAS
CSCD
北大核心
1991年第4期283-291,共9页
Acta Agronomica Sinica
关键词
杂交稻
硝态氮
铵态氮
光合作用
Nitrate
Ammoniun
Photosynthesis
Hormonal balance
Protein and nucleic acid
Hybrid rice
